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. The effect of the SO42– anion on both potentiometry and voltammetry with poly(pyrrole) films doped with chloride or hexacyanoferrate(II/III) ions has been studied and compared with the responses obtained in KCl solutions. Strong interference was observed when the SO42– to Cl– molar ratio was 1:1000, leading to a decrease in polymer film electroactivity at higher sulfate concentrations. The effect...
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